1/10 as a Decimal
1/10 = 0.1. The division comes to rest after 1 decimal place, so you can write the whole value without a bar or an approximation. As a percentage that is 10.00%.
Long division, step by step
Divide the numerator by the denominator the way it is done on paper: bring down a zero, note how many times the denominator fits, keep the remainder, repeat. The remainders are what decide whether the decimal stops.
| Step | Working | Digit | Remainder |
|---|---|---|---|
| 1 | 1 × 10 = 10 | 1 | 0 |
The remainder reaches zero at step 1, which is precisely why the decimal terminates. A zero remainder means nothing is left to carry down.
Rounded to different precisions
How many places you keep depends on the use: money stops at two, engineering often wants three or four, and a science problem usually wants significant figures rather than decimal places.
| Precision | Value | Result |
|---|---|---|
| 1 decimal place | 0.1 | exact |
| 2 decimal places | 0.1 | exact |
| 3 decimal places | 0.1 | exact |
| 4 decimal places | 0.1 | exact |
| Percentage | 10.00% | exact |
Will it terminate?
A fraction has a terminating decimal exactly when its simplified denominator is built only from 2s and 5s. Here the denominator reduces to 10, which factors to 2 × 5 — nothing but 2s and 5s, so the decimal stops. This is a property of the denominator alone: the numerator never decides it.
Questions about 1/10
What is 1/10 as a decimal?
Exactly 0.1. The division terminates because the reduced denominator 10 has no prime factors other than 2 and 5, so the decimal stops after 1 digits.
Is 1/10 already in simplest form?
Yes. 1 and 10 share no common factor, so the fraction cannot be reduced further and the decimal is generated from these exact digits.
How do I round 1/10 to two decimal places?
Two places give 0.1. The exact value is already closed at 1 digits, so rounding only pads or trims zeros rather than changing the value.
What is 1/10 as a percentage?
10.00%, obtained by multiplying the decimal by 100. It is the same number with the decimal point moved two places to the right, and the same rounding rules apply.